—I really don’t know how to thank you enough .—.A. No problem B. Think nothing of it C. No

问题补充：

—I really don’t know how to thank you enough .

—.

A. No problem

B. Think nothing of it

C. Not at all

D. It doesn’t matter

答案：

A. No problem

B. Think nothing of it

C. Not at all

D. It doesn’t matter

解析：think nothing of it：used as a polite response to apologies, thanks, etc,用作回应道歉.感谢等的客气话。故选B。